Re: [PATCH 3/6] usb: typec: add Qualcomm PMI8998 role-switch driver

[Bryan O'Donoghue]

On 18/05/2026 22:45, Dmitry Baryshkov wrote:
> > No software TCPM state machine is used because the hardware handles
> > the Type-C protocol natively, and the PMI8998 interrupt topology does
> > not expose the granular per-event signals the TCPM code path expects.
> > Power Delivery is not implemented in this driver; the PMI8998 PDPHY
> > block at offset 0x1700 (register-identical to PM8150B) can be wired
> > up by a separate driver later if PD negotiation is required.
> I think TCPM / PD-PHY is (more or less) a sensible requirement. Without
> it you can't negotiate higher power modes or AltModes support (which
> means no DP).

If the PDPHY is register compatible  as stated then the PD part is very 
close.

Looking at the pmi8998 STATUS_REG_4

- VBUS_STATUS
- ORIENTATION
- ATTACHED

are all driven. So I believe it would be possible to bring the pmi8998 
into - along side the pmi8998 logic.

@Maxim have you looked at that as an option ?

I believe Casey and Luca? both worked on that.

For preference I think we should try to land pmi8998 into the existing 
TCPM logic though, as another TypeC port handler within the existing logic.

The important signals above, appear to be driven.

---
bod